I find that adding length to the headpipe (2 stroke pipes) is a very effective tool in tuning the torque peak. I generally use 25mm (1 inch added or subtracted) as a place to start. While this seems excessive to most, it will give you enough of a difference to feel. Smaller numbers may not be so easy to feel by seat of the pants. In particular, if the engine/pipe combo is so biased towards top end, adding 1 inch will move the power down to a more normal feeling combo. This is not to say that you will gain HP! Just that the torque peak is easily moved by changing the head pipe length.
Chris